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Given a Grafana panel querying Prometheus with:

medium📝 Analysis Q4 of 15
Microservices - Monitoring and Observability
Given a Grafana panel querying Prometheus with:
rate(http_requests_total[5m])
What does this query show?
AThe per-second average rate of HTTP requests over the last 5 minutes
BThe total number of HTTP requests since server start
CThe current number of active HTTP connections
DThe average response time of HTTP requests
Step-by-Step Solution
Solution:

  1. Step 1: Understand Prometheus 'rate' function

    'rate' calculates the per-second average increase of a counter over a time window.

  2. Step 2: Apply to 'http_requests_total[5m]'

    This means the average requests per second over the last 5 minutes.

  3. Final Answer:

    The per-second average rate of HTTP requests over the last 5 minutes -> Option A

  4. Quick Check:

    Prometheus rate() = average per second [OK]
Quick Trick: rate() shows average per second over time window [OK]
Common Mistakes:
MISTAKES
  • Confusing total count with rate
  • Thinking it shows current active connections
  • Assuming it measures response time

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